29 days ago
Warsaw, PolandSenior
Responsibilities
- Design, build, and maintain scalable backend systems supporting the Bookings product.
- Collaborate with frontend and mobile engineers to deliver features and improve APIs across web, iOS, and Android.
- Participate in technical planning, code reviews, and design discussions.
- Optimize performance, ensure observability, and uphold reliability standards.
- Contribute to the technical roadmap for the Sell Online platform.
- Mentor peers and collaborate across a cross-functional product team.
Requirements
- Require 5+ years of professional backend engineering experience.
- Require fluency in Kotlin or Java and deep experience with Spring Boot.
- Require experience with PostgreSQL, Kafka, Docker, Kubernetes, and AWS.
- Require understanding of RESTful APIs, distributed systems, and event-driven architectures such as CQRS and Event Sourcing.
- Require experience with CI/CD pipelines, GitHub Actions, and observability tools such as Grafana or Honeycomb.
- Prefer familiarity with gRPC, Protobuf, and backend or database performance optimization.
- Value collaborative working, peer mentoring, and focus on delivering merchant value.
Benefits
- Hybrid work arrangement from SumUp’s Warsaw office in Hala Koszyki.
- Virtual Stock Option programme.
- Annual €2000 learning and development budget for conferences or further education.
- On-site gym and subsidized Multisport Card.
- Health insurance for the employee and family, plus life insurance.
- 26 days of paid leave, public holidays, and special leave days.
- One-month sabbatical after three years of service.
- Referral bonus programme.
Tech Stack
Categories
About SumUp
SumUp builds card readers, point-of-sale apps, and payment tools for small businesses, along with accounts, invoicing, and online checkout. It sells hardware and earns fees on payment processing and subscriptions for software and services such as invoicing and loyalty. Founded in 2012 and headquartered in London, the company serves more than 4 million merchants across 30+ markets, and offers options like payment links and Tap to Pay.